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Use the edge of a plastic opening tool to pry the cellular antenna cable up from its socket on the logic board.

De-route the cellular antenna cable out from under the metal fingers attached to the logic board.

When reconnecting the antenna wire be VERY certain that the round connector at the end of the wire is centered on its mating half on the motherboard before applying pressure. Failure to do so will likely destroy both halves of the connector.

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Use the edge of a plastic opening tool to disconnect the Wi-Fi antenna cable connector from the logic board.

When reconnecting the wifi ribbon connector to the mother board be VERY certain that the round connector at the end of the ribbon cable is centered on its mating half on the motherboard before applying pressure. Failure to do so will likely destroy both halves of the connection.

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Carefully lift the logic board from the end closest to the speaker enclosure and slide it away from the top edge of the iPhone.

Remove the logic board.

Before reassembly, be sure to clean all metal-to-metal contact points on the logic board (not the mating halves of connectors) with a de-greaser such as windex or isopropyl alcohol. The oils on your fingers have the potential to cause grounding issues.

There's a small rectangular rubber pad at the top of the logic board that prevents the display cables from chafing against the edge of the board. If it comes loose during your repair, make sure to position it correctly when reinstalling your logic board.

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Before reinstalling the speaker enclosure assembly's screws, be sure the Wi-Fi grounding fingers are installed below the lip in the iPhone's metal case as seen in the second picture.

Before reassembly, be sure to clean all metal-to-metal contact points between the grounding fingers of the Wi-Fi antenna and the case of the iPhone with a de-greaser such as windex or isopropyl alcohol. The oils on your fingers have the potential to cause wireless interference issues.

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Use the edge of a plastic opening tool to gently pry up the display assembly around its perimeter.

Press gently on the home button to push it through the display and make sure it stays behind as the display separates from the iPhone. Otherwise, the home button cable may tear.

De-route the digitizer and LCD cables through the steel inner frame.

When reinstalling the display, carefully straighten the digitizer and LCD data cables, and feed them through the slot cut in the steel frame. This photo shows the display assembly being installed incorrectly, with a fold in the digitizer cable.

When the front panel has been correctly installed, both the LCD and digitizer cables should be immediately next to one another and should be the same length, as shown in the second photo.

If the digitizer cable has been installed incorrectly, it will not reach its socket on the logic board. Do not attempt to pull it through by force, or it will tear. Remove the display assembly, straighten the cable, and feed it through to its full length, as shown.

During reassembly, do not touch the metallic area at the base of the LCD data cable, as this can cause problems with the LCD. If you do touch it accidentally, clean it gently with an alcohol wipe before continuing.

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Be sure to separate the home button from the front panel. If the home button sticks to the front panel you may tear the home button cable.

When replacing the display assembly, note the following:

You may have to reuse the earpiece grille and the clear plastic ring around the front facing camera from the old/damaged assembly. This will depend on where you buy the replacement part.

Your replacement display may come with colored plastic film on the back of the LCD. If so, use the pull tab near the home button to peel the plastic film from the LCD before installing the new display in your iPhone.

After reassembly, note the following:

Clean the touchscreen surface with an alcohol wipe prior to turning the iPhone back on. The alcohol helps dissipate any lingering static electricity, which can cause problems with the display.

After reassembly, connect the iPhone to an AC power source before turning it on for the first time. Once the iPhone has booted up successfully, you can disconnect the AC power.

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How can a company that prides itself on simplicity and elegance make something so needlessly unserviceable? I don't mind the small screws, even if I wonder how many of them really need to be there... but the fragile cables, little black spacers, the pentalobe screws and the glue - oh the inhumanity of the glue! The only thing that makes me happy is, now that Tim Cook's decided that they're going to service these things in-store, the thought of Apple employees sending an earful of expletives up the management chain.

Small and fragile = lite weight. And all of those spacers and glue is to keep everything in place and prevent those small and fragile parts from breaking as you use the phone. If you want a tiny, lite phone there are compromises. And Apple's mantra has never been serviceability. It's about getting you to upgrade to the new cool thing every 1-2 years, way before the phone would normally need servicing. And the Apple store really only services new batteries and screens. For pretty much everything else they just give you a new phone.